Directions to make red lentil and orzo soup. Remove the spice packet. Heat 2 tablespoons of olive oil in a soup pot. Dice 1 onion, 2 carrots, 3 celery ribs, and 1 fennel bulb and add them to the pot. Once they smell fragrant, add the red lentils. Add the spice packet and 2 quarts of water and bring to a boil over high heat. Reduce the heat to medium-low, cover, and simmer for 40-45 minutes, until the lentils are soft. Add a 15 ounce can of diced tomatoes and the orzo and cook for an additional 10 minutes. Taste and adjust seasoning to taste. Stir in a bag of baby spinach and serve with garlic toast.